121112212121011 has 4 divisors (see below), whose sum is σ = 121253204219800. Its totient is φ = 120971220022224.

The previous prime is 121112212121009. The next prime is 121112212121071. The reversal of 121112212121011 is 110121212211121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121112212121011 - 2¹ = 121112212121009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121112212121011.

It is not an unprimeable number, because it can be changed into a prime (121112212121071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70496048106 + ... + 70496049823.

It is an arithmetic number, because the mean of its divisors is an integer number (30313301054950).

Almost surely, 2^{121112212121011} is an apocalyptic number.

121112212121011 is a deficient number, since it is larger than the sum of its proper divisors (140992098789).

121112212121011 is an equidigital number, since it uses as much as digits as its factorization.

121112212121011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140992098788.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 121112212121011 its reverse (110121212211121), we get a palindrome (231233424332132).

The spelling of 121112212121011 in words is "one hundred twenty-one trillion, one hundred twelve billion, two hundred twelve million, one hundred twenty-one thousand, eleven".